Display screen for an air purifier



FIGS. 1-7 are top, front perspective views of a display screen for an air purifier as an inner circular element changes its shape;

FIGS. 8-14 are bottom, left perspective views of FIGS. 1-7;

FIGS. 15-21 are front elevation views of FIGS. 1-7;

FIGS. 22-28 are bottom, right perspective views of FIGS. 1-7; and,

FIGS. 29-35 are bottom, front perspective views of FIGS. 1-7.

The broken lines showing various elements of the display screen for an air purifier are included for the purpose of illustrating non-claimed subject matter and form no part of the claimed design. 

CLAIM The ornamental design for a display screen for an air purifier, as shown and described. 